{2: 1, 9: 1}
{2: 1, 9: 2, 8: 2, 20: 1}
15 20
{2: 1, 9: 3, 8: 3, 20: 1, 4: 2, 15: 3}
19 20
{2: 1, 9: 4, 8: 4, 20: 1, 4: 2, 15: 4, 19: 4}
7 8
{2: 2, 9: 4, 8: 4, 20: 1, 4: 3, 15: 4, 19: 4, 1: 2, 7: 3}
14 15
{2: 2, 9: 5, 8: 5, 20: 1, 4: 4, 15: 4, 19: 4, 1: 2, 7: 4, 3: 3, 14: 5}
{2: 2, 9: 5, 8: 6, 20: 1, 4: 4, 15: 4, 19: 4, 1: 2, 7: 5, 3: 3, 14: 5}
{2: 2, 9: 5, 8: 6, 20: 2, 4: 4, 15: 4, 19: 5, 1: 2, 7: 5, 3: 3, 14: 5}
11 14
{2: 2, 9: 6, 8: 7, 20: 2, 4: 5, 15: 4, 19: 5, 1: 2, 7: 6, 3: 4, 14: 5, 11: 6}
17 19
{2: 2, 9: 7, 8: 8, 20: 2, 4: 5, 15: 5, 19: 5, 1: 2, 7: 7, 3: 4, 14: 6, 11: 7, 5: 6, 17: 5}
8